$DNA$ strand is directly involved in the synthesis of all the following except:

The given figure shows the structure of a nucleosome with its parts labelled as $A, B$ and $C$. Identify $A, B$ and $C$.

Select the correct match for $X$ and $Y$:

Column $X$	Column $Y$
$(1)$ Chromosome	$(P)$ Genetic code
$(2)$ $m-RNA$	$(Q)$ Gene
$(3)$ $t-RNA$	$(R)$ Ribosome
$(4)$ $r-RNA$	$(S)$ Anticodon

What is central dogma and describe the packing of $DNA$ helix?

Match List $I$ with List $II$.

List $I$	List $II$
$A$. Frederick Griffith	$I$. Genetic code
$B$. Francois Jacob and Jacques Monod	$II$. Semi-conservative mode of $DNA$ replication
$C$. Har Gobind Khorana	$III$. Transformation
$D$. Meselson and Stahl	$IV$. $Lac$ operon

Choose the correct answer from the options given below:

What is the correct chronological sequence of the following events?
$1.$ Formation of the chromosome theory of heredity
$2.$ Experiments which proved that $DNA$ is the hereditary material
$3.$ Mendel's laws of inheritance discovery
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